Description of problem:
When connecting USB disks to the FE-12 32_X64 host neither a FE-12 or Windows guest see the USB disks.

Version-Release number of selected component (if applicable):
host kernel.x86_64   2.6.31.9-174.fc12 

How reproducible: Everytime


Steps to Reproduce:
1. Launch Virt Manager
2. Delete all USB devices
3. Add back in USB devices
4. Connect USB disks to host hardware
5. Unmount USB devices from host
6. Launch guest VM
7. Examine system for connected USB devices
  
Actual results:
USB devices are not passing thru to guest

Expected results:
Previosuly on FE-11 the VM guest was mapping USB drives

Additional info:
Fedora guest configuration file.  (Name states FE-11 but it has been upgraded to FE-12)
<domain type='kvm'>
  <name>Fedora-11-Home</name>
  <uuid>714133c3-eda0-eeb8-632c-bd37c7e66ddd</uuid>
  <memory>786432</memory>
  <currentMemory>786432</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-0.11'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type='block' device='cdrom'>
      <driver name='qemu'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/Fedora-11-Home.img'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <interface type='network'>
      <mac address='52:54:00:21:2f:88'/>
      <source network='default'/>
      <model type='virtio'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <target port='0'/>
    </serial>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
    <sound model='es1370'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x1d6b'/>
        <product id='0x0002'/>
      </source>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x13fd'/>
        <product id='0x1340'/>
      </source>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x1d6b'/>
        <product id='0x0002'/>
      </source>
    </hostdev>
  </devices>
</domain>


Windows XP configuration file
<domain type='kvm'>
  <name>Windows-XP-SP3-Home-2003</name>
  <uuid>ee3bc9fe-a724-45b5-b675-11251f5c453f</uuid>
  <memory>786432</memory>
  <currentMemory>786432</currentMemory>
  <vcpu>2</vcpu>
  <os>
    <type arch='i686' machine='pc-0.11'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <source file='/var/lib/libvirt/images/Windows-XP-SP3-Home-2003.img'/>
      <target dev='hda' bus='ide'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
    </disk>
    <interface type='network'>
      <mac address='52:54:00:51:15:4a'/>
      <source network='default'/>
      <model type='rtl8139'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
    <sound model='es1370'/>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
    </video>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x13fd'/>
        <product id='0x1340'/>
      </source>
    </hostdev>
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x1d6b'/>
        <product id='0x0002'/>
      </source>
    </hostdev>
  </devices>
</domain>